Definition of "ultracool" [ultracool]

• Extremely cool. (adjective)

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• "Astronomers announced today that stars of a recently discovered type, dubbed ultracool subdwarfs, take some pretty wild rides as they orbit around the Milky Way, following paths that are very different from those of typical stars."
• "He gets a "nicely written" complement and I get to be "ultracool," or at least my story does."
• "My ultracool HTC Incredible that had everything that a gadget freak could ask for in a mobile device."